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Investments - Narrative (Details) ¥ in Thousands, $ in Thousands			1 Months Ended		12 Months Ended
	Nov. 13, 2018	Sep. 26, 2016	Feb. 28, 2019 CNY (¥)	Feb. 28, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Disclosure of joint ventures [line items]
Investments					$ 13,994	$ 681	$ 1,185
Synergy Ballard JVCo
Disclosure of joint ventures [line items]
Investments					$ 0	676	$ 1,185
Capital contribution						972
Percentage ownership interest		10.00%			10.00%
Weichai Ballard JV
Disclosure of joint ventures [line items]
Investments					$ 13,989	0
Capital contribution					$ 14,286	$ 0
Percentage ownership interest	49.00%				49.00%
Weichai Ballard JV | Capital Contribution
Disclosure of joint ventures [line items]
Capital contribution			¥ 98,000	$ 14,500

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- Definition

The aggregate cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities. [Refer: Subsidiaries [member]]

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The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

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